Re: [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings

[Will Deacon]

On Sat, Sep 12, 2020 at 10:25:59PM -0500, Bjorn Andersson wrote:
> On Fri 11 Sep 12:13 CDT 2020, Robin Murphy wrote:
> > On 2020-09-04 16:55, Bjorn Andersson wrote:
> > > Add a new operation to allow platform implementations to inherit any
> > > stream mappings from the boot loader.
> > 
> > Is there a reason we need an explicit step for this? The aim of the
> > cfg_probe hook is that the SMMU software state should all be set up by then,
> > and you can mess about with it however you like before arm_smmu_reset()
> > actually commits anything to hardware. I would have thought you could
> > permanently steal a context bank, configure it as your bypass hole, read out
> > the previous SME configuration and tweak smmu->smrs and smmu->s2crs
> > appropriately all together "invisibly" at that point.
> 
> I did this because as of 6a79a5a3842b ("iommu/arm-smmu: Call
> configuration impl hook before consuming features") we no longer have
> setup pgsize_bitmap as we hit cfg_probe, which means that I need to
> replicate this logic to set up the iommu_domain.
> 
> If I avoid setting up an iommu_domain for the identity context, as you
> request in patch 8, this shouldn't be needed anymore.
> 
> > If that can't work, I'm very curious as to what I've overlooked.
> > 
> 
> I believe that will work, I will rework the patches and try it out.

Did you get a chance to rework this?

Will